Cytoskeleton and Extracellular Matrix

Which of the following filaments are found in ALL animal cells?

• Keratins

• Vimentins

• Nuclear Lamins

• Neurofilaments

Which of the following make up mitotic spindle?

• Intermediate filaments

• Microtubules

• Nuclear Lamins

• Actin filaments

Tags

NGSS.HS-LS1-4

Microtubules are

• rope like

• mesh like

• hollow tubes

• interlocking chains and ropes

The end of a growing microtubule is rich in which type of tubulin?

• GTP bound tubulin molecules

• GDP bound molecules

• ATP bound tubulin

• ADP bound molecules

During muscle contraction the myosin and actin filaments do not change length?

• True

• False

Inside a muscle fibre, what triggers sarcomeres to contract?

• sudden rise in intracellular Na+

• Increase levels of ATP

• Cell polarisation

• A sudden rise in intracellular Ca2+

When a muscle is stimulated to contract:

• calcium binds to troponin which moves the tropomyosin that otherwise blocks the interaction of actin and myosin.

• calcium binds to tropomyosin which moves the troponin that otherwise blocks the interaction of actin and myosin

• calcium binds to actin allowing it to associate with myosin.

• calcium binds to myosin allowing it to associate with actin

Supportive tissues such as bone, get their strength from

• cells

• extracellular matrix

• cytoskeleton filaments

In connective tissues the tensile strength of the tissue is provided by

• Proteoglycans

• Collagen

• Actin

• Cellulose

Which protein on a fibroblast membrane attaches to the extracellular matrix outside the cell (through adapter molecules) to actin on the inside?

• Proteoglycan

• Cadherin

• Fibronectin

• Integrin